Fiddle block with swivel

Fiddle Tufnol Block - with Swivel

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Tufnol is a traditional laminated plastic material made from phenolic resin and woven cotton or linen fabric.  It is strong and light, and provides an economical, low maintenance and traditional solution for sailing boat blocks.

Our Tufnol blocks are manufactured in the Netherlands with solid stainless steel frames and brass bush bearings.

These fiddle Tufnol blocks have two uneven diameter sheaves located in-line. They are ideal for main sheets and other sail boat applications where a mechanical advantage is required.  

Fitted with a swivel eye, they come in two sizes to work with ropes of 10mm and 12mm diameter.


SKU Shell Size  Rope Size* Sheave
Breaking Load 
Safe Working
021654  4" (100mm)  10mm  42mm & 20mm  Approx. 720kg  360kg
021655  5" (125mm)  12mm  48mm & 25mm  Approx 1200kg  600kg

* Note - we recommend choosing products one rope size size larger than indicated to ensure adequate free movement.